Venting closure caps



Dec. 3o, 195s R. o. POWELL 2,866,570

VENTING CLOSURE CAPS Filed June 25, 1958 INVENTOR fcHH/P afm/1u BY 4A ATTN EYS` United States Patent O 2,866,570 VENTING cLosURE CAPs Richard 0. Powell, San Rafael, Calif., assigner to Owens- Illinois Glass Company, a corporation of Ohio Application .lune 25, 1958, Serial No. 744,451

Claims. (Cl. 21S- 56) The present invention relates to improvements in venting type closure caps for glass containers and has for an object the provision of simple and effective means for venting excessive internal pressure while insuring satisfactory hermetic closing following such venting operation.

An object of my invention is the provision of a novel closure cap liner which is readily assembled with a conventional closure cap and normally po-sitively seals the container hermetically.

A further object of my invention is the provision of a venting type closure cap liner composed of inner and outer disks of cellophane or the like material and an intermediate disk ot aluminum fo-il or similar material, the inner disk formed with normally closed pressure operable slits which when opened by internal pressure establish communication between the container interior and the atmosphere by way of a radial channel between the inner and intermediate disks.

Other objects will be in part apparent and in part pointed out hereinafter.

In the drawings:

Fig. 1 is a fragmentary detail sectional View of a container and closure cap provided with my venting liner.

Fig. 2 is a view taken substantially along the line 2--2 of Fig. 1 showing the complete inner disk.

Fig. 3 is a sectional view taken along the line 3--3 of Fig. 1.

Fig. 4 is a view similar to Fig. 3 showing the slit opened by internal pressure for venting purposes.

In the illustrated embodiment of my invention, it is shown in association with a glass jar having a diametrically reduced neck 11 forming a mouth 12 and top sealing surface or rim 13. Ascrew thread 14 on the exterior of the neck is designed for holding engagement with threads 15 on the skirt 16 of a closure cap 17. This cap may be formed of sheet metal in the usual or any preferred fashion and includes an annular recess 18 to accommodate the peripheral portion of the liner 19 and thereby retain it against accidental displacement. Obviously other retaining means may be employed.

The liner, as shown, is of laminated construction and comprises inner and outer disks 20 and 21, respectively, formed of cellophane membrane and an intermediate disk 22 or core of thin aluminum foil. This liner may well be spaced from the panel of the closure cap 17 by the usual cushion disk 23.

The outer cellophane disk 21 is bonded throughout to the .toil disk 22 by means of a suitable adhesive 24. The inner disk 20 which faces the interior of the jar 10 is bonded to the lower or inner face of the foil disk 22 by means of an adhesive 25. In this instance, however, the adhesive is omitted along a narrow diametrical zone thereby providing a vent channel 26 of very small dimension vertically, or axially. This channel opens at both lll llCe

channel 26. These slits 27 are formed by a cutter (not p shown) and close tightly immediately upon being created. They are of such dimensions as to normally hermetically seal the container. Upon the creation o-f an undesirable degree of internal pressure, these slits or some of them open as indicated in Fig. 4 and release the excess pressure to the vent channel and thence to the atmosphere.

In assembling a closure cap and liner incorporating my invention, the cushion disk is iirst placed in the closure shell. Thereafter the laminated liner 19 is pressed into position so that its peripheral or marginal portion snaps into the annular recess 18. An adhesive'ZS is applied to the rim 13 of the jar after the latter has been filled and thereafter the closure cap is threaded onto the jar. Incident to such cap atiixing operation, the liner becomes bonded to the glass so that communication with the atmosphere is possible only through opening of the slits 27 as explained above.

Modifications may be resorted to within the spirit and scope o-f the appended claims.

I claim:

l. A venting liner for closure capscomprising inner and outer membrane-like disks formed of an impervious material, an intermediate disk of -aluminum foil, the inner disk having a diametrically extending series of normally closed slits therein, means bonding the threeA disks together and applied to create a vent channel immediately overlying and parallel with the series of slits and having at least one end opening through the periphery of the liner.

2. A venting liner as defined in claim l, the slits being disposed in a single line and in end to end relationship across the diameter of the inner disk.

3. In combination a jar having a neck defining a mouth and providing an annular end sealing rim and formed externally with a screw thread, a screw-threaded closure cap, a laminated liner comprising inner and outer disks of au impervious membrane, an intermediate disk of foil, means bonding the three disks together and applied to create a vent channel extending diametrically between the inner and intermediate disks and with at least one end opening through the periphery of the liner, said inner` disk formed with a series of Vent slits normally closed but openable under excessive internal pressure to establish communication between the vent channel and jar interior and means hermetically sealing the liner to the jar rim.

4. The combination dened in claim 3, the closure cap provided with an annular channel of larger Vdiameter than the liner and into which the periphery of the latter projects.

5. The combination defined in claim 3, the vent slits being disposed in end to end relationship along a single line extending across the inner disk.

References Cited in the tile of this patent UNITED STATES PATENTS 1,865,764 Keenan July 5, 1932 2,013,119 Warth Sept.. 3, 1935 2,254,815 Barnby et al. Sept. 2, 1941 2,265,862 Rosentreter Dec. 9, 1941 

